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A bone cyst or geode is a type of cyst that can present itself in the jaw, or on other locations in the body. Types include: * Unicameral Bone Cyst(Simple bone cyst) * Aneurysmal bone cyst * Traumatic bone cyst == History == Aneurysmal bone cysts are benign neoformations which can affect all the skeleton bones. More than half occur in the metaphysis of long bones (especially femur and tibia) and between 12 and 30% in the spine. They were described in 1893 by Van Arsdale, who called these lesions "homerus ossifying haematoma". In 1940 Ewing used the term "aneurismal" to describe these lesions. Jaffé and Lichtenstein first coined the term "aneurismal cyst" in 1942 In 1950 they modified this term to "aneurismal bone cyst". They may be associated with bone tumors. The simple bone cyst is a common, benign, fluid-containing lesion, most commonly found in the metaphysis of long bones, typically the proximal humerus or femur. Pathologic fractures are common, often with minor trauma. These cysts typically resolve after skeletal maturity and are not typically associated with bone tumors. The cause is unknown. These were first recognised as a distinct entity in 1910. Jaffe and Lichtenstein provided a detailed discussion of simple bone cysts in 1942.〔 The traumatic bone cyst, also referred to as a simple bone cyst or hemorrhagic cyst, is a pseudocyst that most commonly affects the mandible of young individuals. It is a benign empty or fluid-containing cavity within the mandible body that does not have evidence of a true epithelial lining. This type of bone cyst is a condition found in the long bones and jaws. There is no definitive cause, though it relates to trauma in the oral region. The likelihood of males being affected by this condition is frequently greater than in females. It appears on radiographs as a unilocular radiolucent area with an irregular but well-defined outline. This term was first described by Lucas in 1929.〔bob, Burkhart, N. (2008, February). Traumatic bone cyst. Oral Exams, 89-90. Retrieved from http://myaccess.library.utoronto.ca/login?url=http://search.proquest.com.myaccess.library.utoronto.ca/docview/225015312?accountid=14771.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「bone cyst」の詳細全文を読む スポンサード リンク
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